Pendulum-mill.



' MAW' No. 787,018. PATENTED APR. 11, 1905. J. WSTENHFER. y

PENDULUM MILL. APPLIQATION FILED Noy. 28, 1902.

.2 SHEETS-SHEET 2.

'Wil-lnessesz' y 'ffii/ma?? if WC UNiTED STATES' PATENT OFFICE.

Patented April 1,1, 1905.

JULius wsTENHoFER, oFpoRTMUivD, GERMANY.

PENDULIUNIENIILL.

SPEIFICATION formingpart of Letters Patent No. 787,018, dated April A11,1905.

Application iiled November Z8, 1902. Serial No. 133,095.

To a/ZZ whom it may concern,.-

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' vertical central section. 5o.

Be it kno'wn that I, JULIUs WsTENI-rnnn, a subject of the Emperor ofGermany, resid-v ing at Dortmund, in the Province of Westphalia,Germany, have invented certain new and useful Improvements inPendulum-Mills;

and I do hereby declare the following to be a full, clear, and exactdescription of the invention, such as will enable others skilled in theart to which it appertains to make and use the same.

This invention relates to improvements in pendulum-mills for grindinghard materials;

travelof the grinding-roller along the inner "circumference of themill-ringonly,'but that it may be accelerated or retarded or evencontrary in direction to that which it will naturally take by therolling of the grinding-roller yalong the mill-ring. i This isattainedby driving the grinding-roller spindles direct by some suitable gear andby causing the circulating Inotion of the grinding-rollers along themillring also to be carried out under the -inliuence of a specialdriving-gear.

A further object which I have in view with my invention is to enable themill Y to grind the materials downto fine dust or flour, as well 'as toreduce the same to a certain degree of comminution only. y A

These objects may be attained by various mod es of construction forcarrying out the inventive idea laid down above andv the gist of whichis to give a positive motion to the grinding-roller both for its rollingor circulating along the mill-ring', as wellv as for its rotationy roundits own geometrical axis, and to arrange `it so that its circumferenceymay touch theinner circumference of the mill-ring or that it may be heldolf from the lattermore or less, as may be desired.

On the accompanying drawings I show one example of carrying out my idea.

Figure 1 is a vertical view, partly seen in a Fig. '2 is a horizontalsection along the broken line I II III IV of Fig. 1. Fig; 3 represents aview similar -to Fig. 1, but with a greater part of the machinesectioned.

4On a bed-plate 1 is placed within a raised ring or flange 2 themill-tub 3, which is armed by the hardened mill-ring 4L, held therein inwell-known manner. The mill tub or pan 3 is surmounted by a casing 5, ofperforated plates, so-as to form a sieve, and a cover 6 is placel'fonthe top of said sieve. This sieve 5 vis surrounded by a casing 7,ofsolid plates, so as to prevent dust from entering into the surroundingrooms. A hopper 8 serves for feeding the material to be ground into themilltub. l On the bed-plate 1 arebased the standards 9, which on the topare united in ahub or boss 10 for carrying the driving-gear of themachine. So far the machine does not present any materially newfeatures. In the bore of the'bushed hub 10, however, there is placed ahollow shaft 11, which below the hub has cast to it jor otherwise fixedthereto two diametrical arms 12`with heads 12, and above said hub iskeyed to the hollow shaft a driving-pulley 13, resting with the lowerface of its boss upon the upper face ofthe hub 10, Vand thus supportinglthe hollow shaft on the vstandards 9.

Inside of' the hollow shaft 11 is placed and guided by brasses a solidshaft 14, to which lis keyed at its upper end a driving-pulley 14C,bearing with the lower face of its boss upon the upper face of thehollow shaft 11, thereby holding the solid shaft in place vertically.shaft 11 there is keyed to the solid shaft 14 a spur-'wheel 15, which isin gear with the wheels 16 on the short shafts 17, which are held in theheads12a of the arms 12 so that they can rotate therein, collars 17Lholding them in place vertically. In the center of the wheels 16 there`are coupled vto the shafts 17 byfa ball-andsocket joint of suitabledesign, so that they can swing out in any direction, the pendulum-shafts18 of the grindingrollers 19. These shafts are surrounded each byaso'cket 20, which, by means of arms 21, projecting horizontally rightand left, are guided in slots 22 of a cross-head 23, held rotatively onthe solid shaft 14. A broad nut wBelow the arms 12 12sL of the hollowArop and washer 24 holds this cross-head in place vertically.

As will be seen from Fig. 3, the head 12u of the arm 12 is bushed out,and it contains the short vertical shaft 17, which is guided therein andso held by a screw and washer 17 that it can rotate therein. Its lowerend is somewhat enlarged and reaches into the bore of the spur-wheel 16,which is connected thereto rigidly. Here the shaft 17 is coupled to theupper end of the shaft 18 by means of a universal ball-joint 17 b 18".This part 18", which is of hemispherical shape and forming the upper endof said shaft 18, is held in the bore of the spur-wheel 16 by a gland18, which is screwed into said bore from below and forms a ball-bearingfor the head 18, thus allowing the shaft 18 free movement in anydirection. Below thegland 18 the shaft 18 passes through and is guidedin the socket or sleeve 20. This sleeve passes through a forked openingor a vertical slot 22a in the cross-head 23, and by the arms or pins 21,projecting sidewardly from it, it is guided in the horizontal slots 22in the cross-head 23, so that it and the millroller 19 can move radiallyas desired without the roller-shaft 18 being hindered in its rotation.

From the description given so far and from the drawings it will now beunderstood that when the pulley 13 is driven round from any suitablesource of power and in the same way the spur-wheel 15 is also turned thehollow shaft 11 will take round with its arms 1212 the roller-shafts 18with the boxes 20, so that the grinding-rollers 19 will roll along theinner circumference of the mill-ring 4C. At the same time thespur-wheels 16 engaging with the spur-wheel 15 roll along this wheel andare thereby turned round their own axes, and `thus cause theroller-shafts 18, to which they are keyed, to be turned round. Since,however, the solid spindle 14, to which the spurwheel15 is keyed,receives its own motion by the pulley 14, the wheels 16 and therollershafts are at the same time driven positively, and it will beeasily understood that by changing the diameters of the pulleys 13 14 ortheir speed and the direction in which they are turned the workingaction of the grinding-roller can be varied at will, its relativemovement with regard to the mill-ring 41 can be-accelerated or retarded,it can be so that the grinding-roller slides upon the mill-ring eitherbecause it runs too fast or because it is dragged upon the mill-ring,and it can even be turned in a contrary direction to that which itnaturally would take by its circulating motion along the mill-ring 4.

Attention may still be called to the wings 18, placed on the shafts 18above the grinding-rollers and working like a fan for driving out thefine dust through the sieve 5. By this means the action of thegrinding-roller can be arranged as best suited to the nature of thematerial to be ground, and it will thus be understood that a millworking always under such favorable circumstances will in all casesrender a maximum of eiiiciency.

Now it may be desirable that the mill shall not grind the material undertreatment down to dust or fine powder or Hour, but that only granulationor the formation of corn or grain of certain size is required, and thiscan be very easily attained by the following arrangement: The pedestals9 are provided with inwardlyprojecting brackets 25. The upper sides oredges of these brackets are oblique or slanting in circumferentialdirection. Their object is to take up and to carry a ring 26, hav-- ingan inner conical or oblique side 26, while at its bottom side it isprovided with three wedgeshaped feet 27, corresponding to the threebrackets 25 on pedestals 9, two of which are only shown in the drawings.Iith these feet the ring 26 rests upon the brackets 25, and it is heldfirmly down upon them by bolts and nuts 28, slots 29 in the ringallowing it to be turned round a certain extent upon the brackets, andit will easily be understood that when the ring is turned either to theright or to the left it will be raised or lowered on account of theoblique bearing-surfaces of the brackets 25 and the wedge-shaped feet27, respectively. Now in the level of the conical side 26 of the ring 26there is tted to each box 20, incasing the vgrinding-roller shaft, adistance-roller 29, which can freely rotate thereon and which bearsagainst the oblique circumference 26 of the ring 26, and thus hindersthe grindingroller to approach the mill-ring more than is desired orkeeps the grinding-roller at such distance- -it may be zeroas willcorrespond to the size of corn or grain desired to produce.

What I claim, and desire to secure by Letters Patent, is-

1. In a pendulum-mill, the combination of a mill-ring withgrinding-rollers, a pair of concentric shafts, arms carried by one ofsaid shafts,the intermediately-jointed rotary shafts of the said rollerscarried by thc said arms, gearing between the said shafts of the rollersand the other concentric shaft for rotating the said roller-shaftsindividually, as they are carried around by the said arms and means forrotating the shaft provided with the said arms substantially as setforth.

2. In a pendulum-mill, the combination of a mill-ring withgrinding-rollers, a pair of concentric shafts, means for independentlyrotating the said shafts, a gear-wheel on the inner shaft, arms carriedaround by the outer shaft, grinding-roller shafts supported by the saidarms and free to turn on their axes and gear-wheels, carried by the saidroller-shafts, which wheels engage the said gear-wheel on the innershaft substantially as set forth.

3. In a pendulum-mill, the combination of a' mill-ring withgrinding-rollers, a pair of concentric shafts, means for rotating thesaid ICO lIO

IIS

ISO

shafts, a gear-wheel on the inner shaft, arms `carried aroundbythe'outer shaft. grindingtric shafts and bearing on their lower endsgrinding-rollers, in combination with the mill-- ring of a tub or panand distance-rollers Q9 on the said intermediately -jointed rotaryshafts in order to regulate the degree oi'comminution ofthe material tobe ground subl stantially as set forth.

In testimony whereof l have aiixed lrn y sig-` nature in presence of twowitnesses.

JULIUS wi'1STEianrnisnf -Witnessesz y OTTO KNIG,

J. A. RITTERsHAUs. Y

